I performed a contrast between two groups using 3dmema and included a covariate. I am actually interested in the regions covarying with my behavioral measure (the covariate), rather than the contrasts with covariate removed. I see that there are actually two covariate subbricks pairs (each with a beta and t-stat), the second pair has an "X" at the end. My guess is that the first subbrick pair [6..7] represents the regions of covariance when collapsing across groups, while the second pair [8..9] with the "X" represents the between group differences with respect to the covariate (i.e., between group differences for the regression slope of the covariate) because I specified that I wanted two separate slopes for each group. Is this correct? Please let me know if I need to be more clear or if more information is needed. Thanks in advance.
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